Powertrain
Definition only
Lights the check engine lamp
P2657: A Rocker Arm Actuator System Stuck On Bank 2
Standardized SAE J2012 code · P26xx — Computer and output circuits
What does P2657 mean?
The rocker arm actuator A on bank 2 stays in the activated state when commanded off.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Common causes
- High Mechanical lock pin stuck in activated position
- Medium Oil control valve spool stuck open
- Low Carbon or debris buildup preventing free movement
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P2657 on the same make and model first.
P2657 in the community
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